UNION FS-955 Key Norton

( Brand: Union ), ( Manufacturer Part Number: FS-955 )

Review UNION Vintage Pre cut Key Motorcycle Triumph Norton Oem Original fits BSA

The **Union FS-955 Pre-Cut Key Triumph BSA/Norton** is a meticulously crafted, high-quality replacement key designed specifically for Triumph and BSA/Norton motorcycles, offering both reliability and precision for riders who demand the best in performance and security. Engineered to fit seamlessly into the ignition systems of these iconic British bikes ranging from classic models like the Triumph Bonneville, BSA Gold Star, or Norton Manx to later variations this key is forged from durable, corrosion-resistant steel, ensuring long-lasting durability even under frequent use. The pre-cut design eliminates the need for customization, providing an instant, ready-to-install solution that matches the original key s profile without compromising on fit or functionality. Whether you're restoring a vintage machine or maintaining a modern classic, this key delivers the perfect blend of authenticity and practicality, allowing you to start your engine with confidence every time. Its smooth, well-balanced cut ensures easy insertion and extraction, reducing wear on the ignition mechanism over time, while its robust construction resists bending or breaking, even in demanding conditions. Ideal for collectors, enthusiasts, and everyday riders, the Union FS-955 is a testament to quality craftsmanship, offering a hassle-free upgrade that preserves the integrity of your motorcycle s original design while enhancing its usability.

The **Union FS-955 Pre-Cut Key Triumph BSA/Norton** is a popular aftermarket fuel injection kit designed for classic British bikes like Triumphs and Nortons. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High Performance Gains**

The FS-955 is a high-quality fuel injection system that delivers significant power increases compared to carbureted setups. It provides better throttle response, smoother power delivery, and improved high-RPM performance, making it ideal for track use or high-speed cruising.

2. **Pre-Cut Key Compatibility**

The "pre-cut key" feature means the system is pre-configured for specific models (Triumph, BSA, Norton), reducing the need for extensive tuning. This simplifies installation and ensures better out-of-the-box performance for the intended bike.

3. **Reliability and Durability**

Union Fuel Injection (UFI) is a well-established brand with a strong reputation for durability. The FS-955 is built to handle the demands of high-performance riding, with robust components that resist wear over time.

4. **Improved Fuel Efficiency and Emissions**

Unlike carburetors, which can waste fuel, fuel injection optimizes fuel delivery, leading to better mileage in some cases. It also reduces emissions, which can be beneficial for older bikes that may not meet modern standards.

5. **Easier Maintenance**

Fuel injection systems generally require less frequent maintenance than carburetors. There are no choke cables, float levels, or jet adjustments to worry about, though regular fuel filter changes and occasional sensor cleaning are still necessary.

6. **Better Cold-Start Performance**

Fuel injection systems like the FS-955 provide more consistent cold starts compared to carburetors, which can struggle with fuel delivery in cold weather.

7. **Customization and Tuning Options**

While pre-cut, the FS-955 can be tuned further using Union s tuning software or third-party tools. This allows riders to optimize performance for specific riding conditions or track use.

8. **Reduced Carbon Buildup**

Carburetors are prone to carbon deposits, which can clog jets and reduce performance. Fuel injection minimizes this issue, leading to cleaner engine operation over time.

9. **Compatibility with Modern Accessories**

The FS-955 integrates well with modern ECUs, telemetry systems, and data logging tools, allowing for advanced monitoring and tuning.

10. **Resale Value for Modified Bikes**

If you plan to sell the bike later, a well-maintained fuel injection setup can be a selling point for enthusiasts who prefer modernized performance.

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### **Cons**

1. **High Upfront Cost**

The FS-955 is significantly more expensive than carburetor upgrades or basic performance kits. The cost includes not only the fuel injection system but also the necessary modifications to the bike s electrical and fuel systems, which may require additional parts (e.g., fuel pump, wiring harness, sensors).

2. **Complex Installation**

While the pre-cut key simplifies things, installing a fuel injection system still requires mechanical and electrical expertise. It involves modifying the fuel tank, wiring new sensors, and potentially recalibrating the ignition system. DIY installation can be challenging, and professional help may be necessary, adding to costs.

3. **Potential for Tuning Challenges**

Even with pre-cut keys, achieving optimal performance may require tuning adjustments. Poor tuning can lead to rough idling, hesitation, or even engine damage if the fuel-air mixture is off. Riders unfamiliar with tuning may struggle to get the best results.

4. **Fuel Quality Dependence**

Fuel injection systems are sensitive to fuel quality. Low-quality or contaminated fuel can clog injectors or damage the system over time. This requires using high-quality fuel and regular filter changes.

5. **Weight Addition**

The FS-955 adds weight to the bike compared to a carbureted setup. While the difference may not be drastic, it can slightly affect handling, especially on lighter classic bikes.

6. **Electrical Complexity**

Fuel injection relies heavily on sensors and electronics. If any sensors fail or wiring is damaged, the system may malfunction, leading to poor performance or no-start conditions. This increases the risk of electrical issues compared to carburetors.

7. **Potential for Overkill on Some Bikes**

For riders who only plan to use their bike for casual cruising or light track days, the power gains of the FS-955 may be excessive. A simpler carburetor upgrade or a less aggressive fuel injection system might suffice.

8. **Learning Curve for Maintenance**

While maintenance is easier than with carburetors, fuel injection systems require familiarity with electronic diagnostics and tuning software. Riders unfamiliar with these tools may find maintenance more daunting.

9. **Compatibility Issues with Aftermarket Parts**

Some aftermarket components (e.g., exhaust systems, camshafts) may not be fully optimized for fuel injection. Pairing them with the FS-955 could require additional tuning or adjustments.

10. **Potential for Voiding Warranty**

If the bike is still under manufacturer warranty, installing a fuel injection system may void it, especially if it involves modifications to the engine or fuel system.

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### **Conclusion**

The **Union FS-955 Pre-Cut Key Triumph BSA/Norton** is one of the most capable fuel injection kits available for classic British bikes. It offers substantial performance improvements, reliability, and ease of maintenance compared to carburetors, making it an excellent choice for riders who want to modernize their bike s power delivery. However, the high cost, complex installation, and tuning requirements mean it is not the best fit for everyone.

For riders who prioritize performance, track use, or a more refined riding experience and are willing to invest the time and money, the FS-955 is a fantastic upgrade. For those on a budget, seeking simplicity, or only planning light use, a carburetor upgrade or a less aggressive fuel injection system might be more practical.

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### **Recommendation**

- You own a Triumph, BSA, or Norton and want to significantly boost performance.

- You are willing to invest in professional installation and tuning.

- You plan to use the bike for track days, high-speed cruising, or aggressive riding.

- You prefer the reliability and efficiency of fuel injection over carburetors.

- You are prepared to maintain the system properly and use high-quality fuel.

- You are on a tight budget and cannot afford the upfront cost or potential tuning expenses.

- You lack mechanical or electrical experience and cannot hire a professional for installation.

- Your riding is casual and you do not need the extra power.

- You are concerned about voiding the bike s warranty or complicating future maintenance.

- You prefer the simplicity of carburetors and do not want to deal with electronic tuning.

For most serious enthusiasts who want to push their classic British bike to its limits, the FS-955 is a worthwhile investment. However, weigh the pros and cons carefully against your budget, riding goals, and technical comfort level before making a decision. If in doubt, consult with a professional mechanic or fuel injection specialist to ensure the upgrade aligns with your needs.

Details:

Please see photos for more detail of condition. This is a USED key, and it shows signs of wear use. The FS code may be stamped on the original key, ignition switch, or lock cylinder.

part #: fs955 prices

• $5.37-$14.99

specifications cyclevintagee:

• for models: Bsa
• for makes: Triumph
• brand: Union
• mpn: Fs-955

payments cyclevintagee:

• other
• wallet: Google-pay
• credit card: Mastercard

shipping cyclevintagee:

• service: USPS Ground Advantage
• type: Fixed
• carrier: USPS
• transit: 3-8 Days
• cost: $4.99
• class: Standard

seller cyclevintagee:

• # reviews: 9608
• city: Natural Bridge Station, Virginia
• rating: 100.0%

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

returns cyclevintagee:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

offer cyclevintagee:

• quantity: 1
• started: March 3, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0

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